Detectives investigating the Salisbury and Amesbury nerve agent attacks have released new images and video of two suspects as they continue to appeal for information.
CCTV footage of the two men, known by their aliases Alexander Petrov and Ruslan Boshirov, shows them arriving and travelling around Salisbury on March 4.
Police have also released pictures of a specially made model of a counterfeit perfume bottle as the Counter Terrorism Policing Network continue with their investigation.
Officers are still appealing to anyone who may have seen either of the two men in the UK between March 2 and 4, or anyone who may have seen the counterfeit Nina Ricci perfume box or bottle that was eventually recovered from the home of a man named Charlie Rowley, in July.
Mr Rowleys partner, Dawn Sturgess, 44, who was later exposed to the nerve agent after handling the contaminated perfume dispenser, died.
Deputy Assistant Commissioner Dean Haydon, Senior National Coordinator for UK Counter Terrorism Policing said: Since we, alongside the CPS, announced details of the two suspects in September, our investigation has continued at pace.
We remain as determined as ever to identify and bring to justice all those responsible for the reckless acts that left four people critically ill and, tragically, saw Dawn Sturgess lose her life.
We are progressing a number of active lines of enquiry but one of the key things we are still to identify is where the counterfeit perfume bottle was between the time we think it was discarded on the afternoon of 4 March, to when Charlie Rowley says he found it on 27 June.
If you think you saw the pink box or bottle anywhere in the Salisbury area during that time, then please get in touch with us.
The first CCTV clip shows the two suspects as they arrive at Salisbury train station on Sunday 4 March at around 11.48am.
The second clip shows the suspects at approximately 11.58ham walking past a petrol station in Wilton Road, which is in the vicinity of the Skripals home address.
This is just prior to when detectives believe the nerve agent was placed on the door handle.
The third clip shows the two men walking over a bridge on Fisherton Street at approximately 1pm hours before they eventually return to Salisbury train station and travel back to Heathrow and catch a flight to Moscow later that night.
A spokesperson for Metropolitan Police said: As Assistant Commissioner Neil Basu stated on September 5, despite meticulous and painstaking searches, and although unlikely, it is impossible to guarantee that there are no other materials present in the Salisbury area.
As such, we continue to repeat the advice from Public Health England; that people should not pick up items which do not belong to them.
Anyone with information can call police in confidence on 0800 789 321 or email [email protected]